src(build): port has_lib.js to javascript

Ref #754 (fix build on BSD)
Ref #813 (static build)

History.md

@@ -1,3 +1,8 @@
+Unreleased / patch
+==================
+
+ * Port has_lib.sh to javascript (#872)
+
 1.6.0 / 2016-10-16
 ==================
 

binding.gyp

@@ -8,8 +8,8 @@
       }
     }, { # 'OS!="win"'
       'variables': {
-        'with_jpeg%': '<!(./util/has_lib.sh jpeg)',
-        'with_gif%': '<!(./util/has_lib.sh gif)'
+        'with_jpeg%': '<!(node ./util/has_lib.js jpeg)',
+        'with_gif%': '<!(node ./util/has_lib.js gif)'
       }
     }]
   ],

package.json

@@ -24,7 +24,7 @@
     "prebenchmark": "node-gyp build",
     "benchmark": "node benchmarks/run.js",
     "pretest": "node-gyp build",
-    "test": "standard examples/*.js test/server.js test/public/*.js benchmark/run.js && mocha test/*.test.js",
+    "test": "standard examples/*.js test/server.js test/public/*.js benchmark/run.js util/has_lib.js && mocha test/*.test.js",
     "pretest-server": "node-gyp build",
     "test-server": "node test/server.js"
   },

util/has_lib.js

@@ -0,0 +1,111 @@
+var query = process.argv[2]
+var fs = require('fs')
+var childProcess = require('child_process')
+
+var SYSTEM_PATHS = [
+  '/lib',
+  '/usr/lib',
+  '/usr/local/lib',
+  '/opt/local/lib',
+  '/usr/lib/x86_64-linux-gnu',
+  '/usr/lib/i386-linux-gnu'
+]
+
+/**
+ * Checks for lib using ldconfig if present, or searching SYSTEM_PATHS
+ * otherwise.
+ * @param String library name, e.g. 'jpeg' in 'libjpeg64.so' (see first line)
+ * @return Boolean exists
+ */
+function hasSystemLib (lib) {
+  var libName = 'lib' + lib + '.+(so|dylib)'
+  var libNameRegex = new RegExp(libName)
+
+    // Try using ldconfig on linux systems
+  if (hasLdconfig()) {
+    try {
+      if (childProcess.execSync('ldconfig -p 2>/dev/null | grep -E "' + libName + '"').length) {
+        return true
+      }
+    } catch (err) {
+      // noop -- proceed to other search methods
+    }
+  }
+
+    // Try checking common library locations
+  return SYSTEM_PATHS.some(function (systemPath) {
+    try {
+      var dirListing = fs.readdirSync(systemPath)
+      return dirListing.some(function (file) {
+        return libNameRegex.test(file)
+      })
+    } catch (err) {
+      return false
+    }
+  })
+}
+
+/**
+ * Checks for ldconfig on the path and /sbin
+ * @return Boolean exists
+ */
+function hasLdconfig () {
+  try {
+    // Add /sbin to path as ldconfig is located there on some systems -- e.g.
+    // Debian (and it can still be used by unprivileged users):
+    childProcess.execSync('export PATH="$PATH:/sbin"')
+    process.env.PATH = '...'
+    // execSync throws on nonzero exit
+    childProcess.execSync('hash ldconfig 2>/dev/null')
+    return true
+  } catch (err) {
+    return false
+  }
+}
+
+/**
+ * Checks for freetype2 with --cflags-only-I
+ * @return Boolean exists
+ */
+function hasFreetype () {
+  try {
+    if (childProcess.execSync('pkg-config cairo --cflags-only-I 2>/dev/null | grep freetype2').length) {
+      return true
+    }
+  } catch (err) {
+    // noop
+  }
+  return false
+}
+
+/**
+ * Checks for lib using pkg-config.
+ * @param String library name
+ * @return Boolean exists
+ */
+function hasPkgconfigLib (lib) {
+  try {
+    // execSync throws on nonzero exit
+    childProcess.execSync('pkg-config --exists "' + lib + '" 2>/dev/null')
+    return true
+  } catch (err) {
+    return false
+  }
+}
+
+function main (query) {
+  switch (query) {
+    case 'gif':
+    case 'jpeg':
+    case 'cairo':
+      return hasSystemLib(query)
+    case 'pango':
+      return hasPkgconfigLib(query)
+    case 'freetype':
+      return hasFreetype()
+    default:
+      throw new Error('Unknown library: ' + query)
+  }
+}
+
+process.stdout.write(main(query).toString())